591 
A very close inspection of the “rust” under a power of about 5 di- 
ameters exhibited, in some cases, a slight gloss on the surface. At this 
stage I became convinced that the “rast” was probably only an effect 
! 
of a fungus, and consequently not the cause of the dying back of the 
branches. On the development of these facts, 1 suggested that Mr. 
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Gates should make a thorough search for specimens of “rust” exhibiting 
a slight translucency. In due time specimens were received from him 
